Ionia Weather Forecast

    • 64
    • 81

    Rain Showers Likely

    • 60
    • 79

    Partly Sunny

    • 62
    • 81

    Chance Rain Showers

    • 58
    • 78

    Chance Rain Showers

    • 55
    • 74

    Mostly Sunny

    • 57
    • 75

    Partly Sunny

Today 10 Aug Ontario

Mostly cloudy. Showers likely this Morning, then Showers likely with a chance of Thunderstorms this afternoon. Highs Ranging from the upper 70s on the Hilltops to the lower 80s across the lower Elevations. Light Winds, becoming west 10 to 15 Mph. Chance of rain 70 percent.

Tonight 10 Aug Ontario

Mostly cloudy. A chance of Showers and Thunderstorms in the evening. Muggy with Lows in the mid 60s. West Winds 5 to 10 Mph, becoming light. Chance of rain 50 percent.

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Ionia Temperature Statistics

August Temperature

Rochester, Greater Rochester International Airport (15.5 miles)

  • Lowest 4 August, 2026

    57.7 °F

  • Average August

    73.9 °F

  • Highest 5 August, 2026

    87.7 °F

Climate (2021–2026)

Rochester, Greater Rochester International Airport (15.5 miles)

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  • Average Low 2021–2026

    42.3 °F

  • Average 2021–2026

    50.8 °F

  • Average High 2021–2026

    59.6 °F
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